Loosing Preprogrammed Channels After Shut Down Magnavox Dvd Player

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When turning off Magnavox DVD player it looses all preprogrammed channels. Update (06/23/2018) this is a table unit, a ZC352MW8A model. from Magnavox. Built in 2007.

We really need to know the exact model. If this is a portable player it may have a type of CMOS or PRAM battery that has failed. UPDATE Replace the four batteries Technical Details Brand NameMagnavoxItem Weight4.7 pounds Package Dimensions19.6 x 12.3 x 6.6 inches Batteries4 AAA batteries required. https://www.amazon.com/Magnavox-ZC352MW8…

They are no batteries in this unit. It is a Magnavox dvd recorder model number ZX352mw8A. I can program the channels into it, then after an hour of being shut down it looses all of the channels. It is not a portable player.